Stencil-producing plate.



L. LEWIS.

STENCIL PRODUCING PLATE.

APPLICATION FILED JUNE 3. 19:5.

1 5386, 363i. Patented Dec. 3, 1918.

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all?) tours rinwrsyor Lennon, nineteen).

lessees.

T all whom) itmay mam.- y y Be ,it known thatI, Looisllnwls, a sub jectof His Majesty the King of England, residing at London, England, have invented certain new and useful Improvements in Stencil-Producin Peasant which the fol; lowing isa speci cation. in

This inventionjdeals with the production and use of printing stencils after the mane ner of the Zuccato perforatingniethod in which prepared paper suchias thinfibrous paper sheets coated withparafiin wax, or thin metallic sheets, such as tinfoihare laid on'a line file-like plate or surface of har dened steeland subjected topressure from a hardened steel point or style or type, the

teeth of the file, whereverthepen or. type exerts pressure, perforating theppaper or the like, or causing thfe paraffin w ger the waxed paper to spread, to produce aporous V outline in the shape of the imprbssedletter or character or drawing through which the ink may pass in printing trypographically.

v The chief object of the present invention, is to enable trypographic stencils to be made by tracing. p

.lo .thls end according to this invention a stencil producing plate or surface of W ley fabric is used as the stenc1l-perforat1ng me: dium; this plate or surface being supported by a transparent rigid backing having behind or under it a source of light. Thus the original. to be copied by tracing, being supported under the stencil-perforating medium, preferably against that face of the transparent backing with aspect away from 1 the stencil-perforatmg medium, as by means of a covering transparent plate, and a sheet of transparent or semi-transparent stencil material being placed over the stencil-pro ducing medium, the making of a trypographic stencil copy of the original direct by tracing is accomplishable with good result by any ordinary person. As the stencil material the waxed paper known as pre' pared cyclostylepaper will be found quite suitable.

Further according to a preferred embodiment of the present invention and to better realize the chief object thereof the cooperating elements viz. the stencil-producing medium and the transparent rigid backing are constituted in combination as a unit in which the component elements by direct or indirect intercontrol are relatively bodily 1 s'rnncrnrnonncme PLATE.

it Specification of Letters Patent.

effective life thereof in proper condition as invention is furnished with a sust ining sun p r te teanee; 3,19%; 3 a pease emes 19 15. SeriaINmS-LQ'Z'Q. a

i i immovable or atlejastrelatively bodilyim Ifo rthe purposefof aintaining thewire fabric stencil-producing medium during the p,

an operating surface, this, under the present a rounding border or surrounding narginaxh" IlIIl of the requisite r1g1d1ty, such as a wooden or metal frame. Thus; the Whole While by giving such surrounding rigidrim or border suflicieiit depth to form a fstoplor positioning rim or alternatively by furnish pins, the sustaining border or rim can be usedqto alsoposition and hold thestencil producing "surface in relation to" its rigid i l i opaque material; tliisl part of the present i I invention, viz, a wire-fabric stencil-produo ing sheet orsurface having sustaining backing, whetherthis be of transparent of border or both a sustainingand positioning border or marginis not confinedonly to casesof producing trypographic stencils by l tracing.

Preferably the component parts of the conveniently the unit detachably held in mayalso serve to retain the stencil material in position while copying thereon from the original. y i

The size of the mesh of the wire-fabric tracing unit are separably combinedpjand y 1 a suitable holder whereby the holding means may vary according to the finenessor coarse ness ofthe printing desired but it must not be so open as to allow the point orstyle or type-to lacerate 0r unduly stress the material of which the stencil is made, by driving or forcing it down into or at the interstices of the fabric. Thus the wire-fabric must be of such a mesh in relation to the impression element, that a succession of more or less fine holesare produced in the parafiin-paper or its equivalent when writing or typing thereon while placed on the wire-fabric. a

In a form of the invention found to work well a fabric of woven copper wire hav;

ing 200strands to the linear inch was used and asheet of this was fitted to a trans parent backing plate and clamped at the edges by a surrounding frame, or tightens ing frame, comparable to the rlmof drum or tambourine. The backing plate 65 area of theyperforating medium becomes equally available for tracing whenso used,

used for this purpose may conveniently be of glass.

Clhus in the drawings:

Figure l is a plan View.

Fig. 2 is an elevation, and j Fig. 3 a sectional elevation of one constructionalform of device under the invention for stencil making after the Zuccato method, by tracing.

Fig. l illustrates afragment of a wire fabric stencil-producing surface.

a designates a dual supporting and light frame or part light frame formed with a ledge b on whicha removable supporting frame a i received with a fairly close lit. The tracing unit comprisesa frame cZ having rounded off or beveled outerupper edges and a frame 2' between which, the margin of a wire-fabric sheet 7' is gripped. r, y

The clamping frames (Z and 71 form both. a sustaining and positioning border or margin for the wire-fabric which in itself is too flexible to be self supporting as an effective stencil-producing medium.

By appropriate dimensioning of the frame (Z and the transparent backing Z, the inner faces of the frame form a detachable mount 01 f ame f r re eiving the backing and for holding this so that by the direct intercoir, 'trol thereby created there canbe 110 substantial relative bodily displacement ofthe frame and the backing. f

In order to protect the original drawing- 1 or the like from injury during copying it isconvenient and indeed preferred to secure this against the under face of the backing Z by a transparent cover plate m, the backing thereby virtually becoming a dyad of superposed plates which, as shown, form one element of'the tracing-unit; the respective elements being under direct intercontrol as regards any relative bodily displacement as aforesaid.

As depicted, the tracing-unit is in part supported by the top edge of the light or part light frame a and in part by the upper face of the removable frame 0. And in order to fasten the unit in relation to the frames a and 0, a holding frame it having an interior horizontal marginal ledge e is provided to fit over the ti'acing-unit-and secure this against movement in any direction in relation to the frame 0, when clips or other suitable fastenings y' carried by the latter are engaged with the frame it. Under the glass there will be a suitable source of li ht which may be either reflected day or artificial light or direct artificial light or any combination thereof.

Having placed the drawing or the like to be copied between the superposed plates of the backing the Wire-fabric sheet is fitted over the backing, a sheet of stencil material 9 is placed over the wire-fabric and the whole fixed by the holding frame it, the margin of the stencil sheet being gripped between the frames 2' and h. A stencil copy of the original may then be produced by a stylus without difliculty.

What I claim and desire to secure by Letters Patent is In a stencil producing apparatus, a supporting frame provided with a ledge located below the top of the frame, a removable frame comprising a plurality of parts resting on said ledge, two transparent plates resting on said supporting frame and reinovably clamped to said removable frame,

LOUIS LEVV'IS.

Copies of this patentmay be obtained for five cents each. by addressing the Commissioner of Patents Washington, D. O. 

